assignment 15
networking and communications
15nd week
The aim for this week is design, mill and program a network between at least two processors.
At the beggining, i was wondering about creating a wireless network, but we didn´t had all the components at our lab, and without heat bomb is almost impossible to solder the bluetooth/wifi chips that we had.
So, the basic BUS protocol with two wires (tx/rx).
TX/RX
As for my final project I need to control a few bipolar stepper motors´speed with potentiometers, I can communicate the "control" board with the "actuactors" one. For this initial test, with one is enough
Bridge + potentiometer
I re-designed my Hello potentiometer board from input devices week, moving the input pin to have the tx/rx pins free to allow serial communication. According to the datasheet, at the Attiny45 those pins corresponds with PB3 and PB4 
Stepper Motor
For the "slave", I redesigned the New Bipolar Stepper board that I made at the second/third chance at the output devices week, moving the connections to have the TX/RX Pins free.
I´ve used this board to solve Output devices assignment at the end.
Communication
As I saw in previous assignments, for Serial Communication is needed the SoftwareSerial library in Arduino IDE.
The "master" should write over Serial the desired value, and the "slave" reads it.
I had to remember the Attiny´s pinout correspondance with Arduino to identify the RX/TX pins. RX must be connected with TX in the other board and TX to RX as well.
My potentiometer board was giving me a short noisy range of values. Then, for test if the Serial Communication is working properly, I hand-shacked the values to send over serial between the two boards.
Serial test stepper from Marta Verde on Vimeo.
EMBEDDED NETWORKING AND COMMUNICATIONS |
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Described your design and fabrication process using words/images/screenshots |
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Explained the programming process/es you used |
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Outlined problems and how you fixed them |
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Included original design files and code |
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